JPS5741621A - Bilevel phase grating type focal plane - Google Patents
Bilevel phase grating type focal planeInfo
- Publication number
- JPS5741621A JPS5741621A JP55117925A JP11792580A JPS5741621A JP S5741621 A JPS5741621 A JP S5741621A JP 55117925 A JP55117925 A JP 55117925A JP 11792580 A JP11792580 A JP 11792580A JP S5741621 A JPS5741621 A JP S5741621A
- Authority
- JP
- Japan
- Prior art keywords
- mountains
- bilevel
- focal plane
- phase grating
- grating type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/40—Optical focusing aids
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Viewfinders (AREA)
Abstract
PURPOSE: To modulate diffraction characteristics of a bilevel phase grating type focal plane according to the relative arrangement relation of circular or annular zones, by forming circles forming mountains or valleys or annular zones having concentric mountains and valleys alternately in every fine unit pattern without overlapping them.
CONSTITUTION: In the center of a square unit pattern, one circular mountain (2a) is formed, and four circular mountains (2b) on the diagonal lines and four mountains (2c)between the mountains (2b) are further formed while the remaining part is left as a valley.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55117925A JPS5741621A (en) | 1980-08-26 | 1980-08-26 | Bilevel phase grating type focal plane |
DE3132782A DE3132782C2 (en) | 1980-08-26 | 1981-08-19 | Two-stage phase grating focusing plate |
US06/296,136 US4598977A (en) | 1980-08-26 | 1981-08-25 | Bi-level phase grating focusing plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55117925A JPS5741621A (en) | 1980-08-26 | 1980-08-26 | Bilevel phase grating type focal plane |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5741621A true JPS5741621A (en) | 1982-03-08 |
Family
ID=14723582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55117925A Pending JPS5741621A (en) | 1980-08-26 | 1980-08-26 | Bilevel phase grating type focal plane |
Country Status (3)
Country | Link |
---|---|
US (1) | US4598977A (en) |
JP (1) | JPS5741621A (en) |
DE (1) | DE3132782C2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4697878A (en) * | 1984-03-01 | 1987-10-06 | Minolta Camera Kabushiki Kaisha | Bi-level focusing plate of phase grating type |
JPH01280740A (en) * | 1988-05-07 | 1989-11-10 | Canon Inc | Phase type focusing screen |
JPH0259733A (en) * | 1988-08-25 | 1990-02-28 | Canon Inc | Phase type reticle |
US4946252A (en) * | 1987-08-05 | 1990-08-07 | Asahi Kogaku Kogyo Kabushiki Kaisha | Focusing screen |
JPH02226202A (en) * | 1989-02-28 | 1990-09-07 | Canon Inc | Phase type diffusion plate |
JPH0331801A (en) * | 1989-06-28 | 1991-02-12 | Canon Inc | Phase type diffusion plate |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH079483B2 (en) * | 1985-10-22 | 1995-02-01 | 株式会社クラレ | Morphological index bimodulation phase grating |
US5161058A (en) * | 1988-05-31 | 1992-11-03 | Canon Kabushiki Kaisha | Focusing screen |
US5089835A (en) * | 1989-02-28 | 1992-02-18 | Canon Kabushiki Kaisha | Phase-type diffusing plate |
US5124843A (en) * | 1989-12-27 | 1992-06-23 | Massachusetts Institute Of Technology | Array illuminator using a binary optics phase plate |
US5248876A (en) * | 1992-04-21 | 1993-09-28 | International Business Machines Corporation | Tandem linear scanning confocal imaging system with focal volumes at different heights |
US6516152B1 (en) | 1999-05-13 | 2003-02-04 | Minolta Co., Ltd. | Focusing screen for use in camera |
US9684116B2 (en) * | 2014-08-18 | 2017-06-20 | New Optics, Ltd | Light guide plate, and backlight unit and display device including the same |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3547546A (en) * | 1966-05-04 | 1970-12-15 | Sprague Electric Co | Multiple image forming device |
IL50125A (en) * | 1976-07-26 | 1980-11-30 | Yeda Res & Dev | Holographic focusing screens |
JPS559568A (en) * | 1978-07-06 | 1980-01-23 | Minolta Camera Co Ltd | Focal plate using phase type diffraction grating |
DE2946005A1 (en) * | 1978-11-21 | 1980-05-29 | Minolta Camera Kk | Phase shift raster plate for viewfinder - includes rectangular array with wide angle enhancement |
-
1980
- 1980-08-26 JP JP55117925A patent/JPS5741621A/en active Pending
-
1981
- 1981-08-19 DE DE3132782A patent/DE3132782C2/en not_active Expired
- 1981-08-25 US US06/296,136 patent/US4598977A/en not_active Expired - Fee Related
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4697878A (en) * | 1984-03-01 | 1987-10-06 | Minolta Camera Kabushiki Kaisha | Bi-level focusing plate of phase grating type |
US4946252A (en) * | 1987-08-05 | 1990-08-07 | Asahi Kogaku Kogyo Kabushiki Kaisha | Focusing screen |
JPH01280740A (en) * | 1988-05-07 | 1989-11-10 | Canon Inc | Phase type focusing screen |
JPH0259733A (en) * | 1988-08-25 | 1990-02-28 | Canon Inc | Phase type reticle |
JPH02226202A (en) * | 1989-02-28 | 1990-09-07 | Canon Inc | Phase type diffusion plate |
JPH0331801A (en) * | 1989-06-28 | 1991-02-12 | Canon Inc | Phase type diffusion plate |
Also Published As
Publication number | Publication date |
---|---|
DE3132782C2 (en) | 1986-03-27 |
DE3132782A1 (en) | 1982-05-13 |
US4598977A (en) | 1986-07-08 |
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